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Aquarium reactor media

There are three popular types of aquarium¬†reactor media: Activated carbon Granulated Ferric Oxide (GFO) Biopellets What is activated carbon? Activated carbon is an old-school filtration media that’s been around since the dinosaurs. ¬†It is one of the purifying agents inside a Brita brand water filter, if you are familiar with those. Activated carbon is used because it is great at …